Definition of "top-up" [top-up]

• That serves as an addition (adjective)
• Additional credit purchased for a mobile phone. (noun)
• A dose of epidural anesthetic added to previously injected spinal anesthetic in combined spinal-epidural anesthesia (noun)

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• "Banks using the facility need to pledge so-called top-up collateral if the value of the loan portfolio falls by more than 5 percent."
• "But it is unclear if that oil was being siphoned from existing stocks and how quickly workers would be able to top-up the storage tanks if production from some fields has been halted."
• "I planned on taking parental leave when our first daughter was born (we had salary top-up), but I ended up switching jobs so it never happened."